Media flow-around problem when the codec is changed to t38
We have a problem about media flow-around. We send a fax from MGCP side to H323 side and the call is established with G729 codec between TG-1 and TG-2. all gw's that is between TG-1 and TG-2 is configured "never route media" also ipipgw is configured "media flow-around". And then CED tone is detected, TG-2 send a Request mode include T38 to switch over T38. And also ipipgw side send a RM to SBC side. MGCP side accept to switch to T38. iptoipgw side send an OLC with T38 codec and its own IP for media. This OLC message is not include TG-2 media IP. So TG-1 send T38 rtp packets to ipipgw's ip and TG-2 send T38 RTP packets to TG-1 directly but no T38 RTP packets are received from TG-1 to TG-2. Because of fax call is failed. Do you know why the iptoipgw behavior like this? Is this a bug? Do you have any suggestion?
Call direction is
Fax Machine == AS 5350XM(TG-1) --MGCP -- CA --SIP-- SBC --h323--AS5350XM(ip to ip gw) --H323--AS5350XM(TG-2) == Fax Machine
iptoipgw's IOS version is "Version 12.4(15)T12".
voice service voip media flow-around allow-connections h323 to h323 fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711alaw h323 sip !
dial-peer voice 2 voip permission orig description ### General Incoming ### huntstop preference 10 service routing voice-class aaa 1 incoming called-number .T codec transparent ip qos dscp cs3 signaling
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